The cycling event known for its grueling mountain stages is the Tour de France. This prestigious annual race covers roughly 3,500 kilometers through challenging terrains, including steep mountain passes in the Alps and Pyrenees. The race tests cyclists' endurance, climbing skills, and tactics over three weeks in July. Riders face various challenges, such as harsh weather and rigorous elevation changes, making it one of the most demanding sporting events globally. Contenders often dedicate their careers to preparing for this iconic race, aiming to wear the coveted yellow jersey.